Rapid signal acquisition and synchronization for access...

H - Electricity – 04 – B

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H04B 1/7077 (2011.01) H04W 56/00 (2009.01) H04B 7/26 (2006.01)

Patent

CA 2308631

A system and method for rapidly acquiring timing of an access transmission that uses an access probe (500) that is transmitted in stages. A first stage (560) of the access probe preamble (520) is spread with a short pseudonoise (PN) code pair. A second stage (570) of the access probe preamble (520) is spread with both the short PN code pair and a long PN code. Transmitting the access probe (500) in stages (560, 570) reduces the number of hypotheses, and hence the time, required by a receiver attempting to acquire the access probe (500).

L'invention concerne un système et un procédé permettant d'acquérir rapidement une synchronisation d'une transmission à accès mettant en oeuvre une sonde d'accès (500) transmise par étages. Un premier étage (560) du préambule (520) de la sonde d'accès est étalé à l'aide d'une paire de codes courts à bruit pseudo-aléatoire (PN). Un second étage (570) du préambule (520) de la sonde d'accès est étalé à l'aide à la fois d'une paire de codes PN courts et d'une paire de codes PN longs. La transmission de la sonde d'accès (500) par étages (560, 570) permet de réduire le nombre d'hypothèses, et donc le temps requis par un récepteur cherchant à acquérir la sonde d'accès (500).

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